Q2K3 opened a new issue, #30754:
URL: https://github.com/apache/shardingsphere/issues/30754

   As above, memory mode has been removed since V5.2.0.
   Using it in V5.2.0 or higher version (not test yet) will get an exception 
with message below
   
   > SPI-00001: No implementation class load from SPI 
`org.apache.shardingsphere.mode.manager.ContextManagerBuilder` with type 
`Memory`.
   
   Things about why 'memory mode' was suddenly and quietly removed without 
compatibility are another question to care about later.
   But now there are some points I want to suggest:
   
   - Adding clear log which removing memory mode into V5.2.0 release log. (help 
user realize removing directly)
   - Adding clear highlight which removing memory mode in V5.2.0 and higher 
version [document](https://shardingsphere.apache.org/document/). (good 
documents should alert user about deprecated or removing features)
   - Last, there are some official examples in tag 
[V5.2.0](https://github.com/apache/shardingsphere/blob/5.2.0/examples/shardingsphere-jdbc-example/single-feature-example/sharding-example/sharding-spring-boot-mybatis-example/src/main/resources/application-sharding-tables.properties)
 / 
[V5.2.1](https://github.com/apache/shardingsphere/blob/5.2.1/examples/shardingsphere-jdbc-example/single-feature-example/sharding-example/sharding-spring-boot-mybatis-example/src/main/resources/application-sharding-tables.properties)
 (not cover all) still using memory mode in application.properties file. 
examples mentioned above seem not to work as expect. I suppose there has need 
to recheck examples and fix them.
   
   Thks for all contributors in this project and waiting for your response and 
discussion.


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